Horizon Misses on Lupus Phase 2 Endpoint

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Horizon Therapeutics says a Phase 2 clinical trial evaluating daxdilimab for treating systemic lupus erythematosus (SLE) failed to show a statistically significant separation between daxdilimab and placebo on the primary endpoint. The company says the primary endpoint was the proportion of patients to achieve a British Isles Lupus Assessment Group (BILAG) 2004 Index-based Combined Lupus Assessment (BICLA) response and an oral glucocorticoid (OGC) dose of less than 7.5 mg/day (prednisone equivalent), which would represent a reduction from the baseline OGC dose at 48 weeks. BICLA is a composite measure indicating low SLE disease activity, it says, noting that numerical differences were seen in other endpoints. No safety concerns were reported in the study.

Daxdilimab is described by Horizon as an anti-ILT7 human monoclonal antibody that depletes certain dendritic cells. “Depleting these cells may interrupt the cycle of inflammation that causes tissue damage in a variety of autoimmune conditions,” the company says.

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